(c) The Security and Safety Services should perform more rigorous and regular checks on contracted personnel and any additional costs should be appropriately reflected in the overall costs of the outsourced operation, or charged to the contractors in proportion to the size of their personnel on United Nations premises (para.
reflejarse debidamente en los gastos generales de la ope-ración contratada al exterior o imputarse a los contratistas en proporción al número de sus empleados que trabajen en los locales de las Naciones Unidas (párr.